ftpcmd_y.txt

基于UNIX的FTP源代码

				send_file_list($4);
			free($4);
		}
	| LIST check_login CRLF
		{
			if ($2)
				retrieve("/bin/ls -lgA", "");
		}
	| LIST check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				retrieve("/bin/ls -lgA %s", $4);
			if ($4 != NULL)
				free($4);
		}
	| STAT check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				statfilecmd($4);
			if ($4 != NULL)
				free($4);
		}
	| STAT check_login CRLF
		{
			if ($2)
				statcmd();
		}
	| DELE check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				delete($4);
			if ($4 != NULL)
				free($4);
		}
	| RNTO check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL) {
				if (fromname) {
					renamecmd(fromname, $4);
					free(fromname);
					fromname = NULL;
				} else {
					reply(503,
					  "Bad sequence of commands.");
				}
			}
			if ($4 != NULL)
				free($4);
		}
	| ABOR check_login CRLF
		{
			if ($2)
				reply(225, "ABOR command successful.");
		}
	| CWD check_login CRLF
		{
			if ($2)
				cwd(pw->pw_dir);
		}
	| CWD check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				cwd($4);
			if ($4 != NULL)
				free($4);
		}
	| HELP CRLF
		{
			help(cmdtab, NULL);
		}
	| HELP SP STRING CRLF
		{
			char *cp = $3;

			if (strncasecmp(cp, "SITE", 4) == 0) {
				cp = $3 + 4;
				if (*cp == ' ')
					cp++;
				if (*cp)
					help(sitetab, cp);
				else
					help(sitetab, NULL);
			} else
				help(cmdtab, $3);
			free ($3);
		}
	| NOOP CRLF
		{
			reply(200, "NOOP command successful.");
		}
	| MKD check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				makedir($4);
			if ($4 != NULL)
				free($4);
		}
	| RMD check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				removedir($4);
			if ($4 != NULL)
				free($4);
		}
	| PWD check_login CRLF
		{
			if ($2)
				pwd();
		}
	| CDUP check_login CRLF
		{
			if ($2)
				cwd("..");
		}
	| SITE SP HELP CRLF
		{
			help(sitetab, NULL);
		}
	| SITE SP HELP SP STRING CRLF
		{
			help(sitetab, $5);
			free ($5);
		}
	| SITE SP UMASK check_login CRLF
		{
			mode_t oldmask;

			if ($4) {
				oldmask = umask(0);
				(void) umask(oldmask);
				reply(200, "Current UMASK is %03o", oldmask);
			}
		}
	| SITE SP UMASK check_login SP octal_number CRLF
		{
			mode_t oldmask;

			if ($4) {
				if (($6 == -1) || ($6 > 0777)) {
					reply(501, "Bad UMASK value");
				} else if (!umaskchange) {
					reply(550,
					    "No permission to change umask.");
				} else {
					oldmask = umask($6);
					reply(200,
					    "UMASK set to %03o (was %03o)",
					    $6, oldmask);
				}
			}
		}
	| SITE SP CHMOD check_login SP octal_number SP pathname CRLF
		{
			if ($4 && ($8 != NULL)) {
				if (($6 == -1) || ($6 > 0777))
					reply(501,
					    "CHMOD: Mode value must be between "
					    "0 and 0777");
				else if (!umaskchange)
					reply(550,
					    "No permission to change mode of %s.",
					    $8);
				else if (chmod($8, $6) < 0)
					perror_reply(550, $8);
				else
					reply(200,
					    "CHMOD command successful.");
			}
			if ($8 != NULL)
				free($8);
		}
	| SITE SP check_login IDLE CRLF
		{
			if ($3)
				reply(200,
				    "Current IDLE time limit is %d "
				    "seconds; max %d",
				    timeout, maxtimeout);
		}
	| SITE SP check_login IDLE SP NUMBER CRLF
		{
			if ($3) {
				if ($6 < 30 || $6 > maxtimeout) {
					reply(501,
					    "Maximum IDLE time must be between "
					    "30 and %d seconds",
					    maxtimeout);
				} else {
					timeout = $6;
					(void) alarm((unsigned) timeout);
					reply(200,
					    "Maximum IDLE time set to %d seconds",
					    timeout);
				}
			}
		}
	| STOU check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				store($4, "w", 1);
			if ($4 != NULL)
				free($4);
		}
	| SYST check_login CRLF
		{
			if ($2)
#ifdef unix
#ifdef BSD
			reply(215, "UNIX Type: L%d Version: BSD-%d",
				NBBY, BSD);
#else /* BSD */
			reply(215, "UNIX Type: L%d", NBBY);
#endif /* BSD */
#else /* unix */
			reply(215, "UNKNOWN Type: L%d", NBBY);
#endif /* unix */
		}

		/*
		 * SIZE is not in RFC959, but Postel has blessed it and
		 * it will be in the updated RFC.
		 *
		 * Return size of file in a format suitable for
		 * using with RESTART (we just count bytes).
		 */
	| SIZE check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL)
				sizecmd($4);
			if ($4 != NULL)
				free($4);
		}

		/*
		 * MDTM is not in RFC959, but Postel has blessed it and
		 * it will be in the updated RFC.
		 *
		 * Return modification time of file as an ISO 3307
		 * style time. E.g. YYYYMMDDHHMMSS or YYYYMMDDHHMMSS.xxx
		 * where xxx is the fractional second (of any precision,
		 * not necessarily 3 digits)
		 */
	| MDTM check_login SP pathname CRLF
		{
			if ($2 && $4 != NULL) {
				struct stat stbuf;
				if (stat($4, &stbuf) < 0)
					reply(550, "%s: %s",
					    $4, strerror(errno));
				else if (!S_ISREG(stbuf.st_mode)) {
					reply(550, "%s: not a plain file.", $4);
				} else {
					struct tm *t;
					t = gmtime(&stbuf.st_mtime);
					reply(213,
					    "%04d%02d%02d%02d%02d%02d",
					    TM_YEAR_BASE + t->tm_year,
					    t->tm_mon+1, t->tm_mday,
					    t->tm_hour, t->tm_min, t->tm_sec);
				}
			}
			if ($4 != NULL)
				free($4);
		}
	| QUIT CRLF
		{
			reply(221, "Goodbye.");
			dologout(0);
		}
	| error
		{
			yyclearin;		/* discard lookahead data */
			yyerrok;		/* clear error condition */
			state = 0;		/* reset lexer state */
		}
	;
rcmd
	: RNFR check_login SP pathname CRLF
		{
			restart_point = (off_t) 0;
			if ($2 && $4) {
				if (fromname)
					free(fromname);
				fromname = renamefrom($4);
				if (fromname == NULL)
					free($4);
			} else if ($4) {
				free ($4);
			}
		}

	| REST check_login SP byte_size CRLF
		{
			if ($2) {
				if (fromname) {
					free(fromname);
					fromname = NULL;
				}
				restart_point = $4;	/* XXX $4 is only "int" */
				reply(350, "Restarting at %qd. %s",
				    restart_point,
				    "Send STORE or RETRIEVE to initiate transfer.");
			}
		}
	;

username
	: STRING
	;

password
	: /* empty */
		{
			$$ = (char *)calloc(1, sizeof(char));
		}
	| STRING
	;

byte_size
	: NUMBER
	;

host_port
	: NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
		NUMBER COMMA NUMBER
		{
			char *a, *p;

			if ($1 < 0 || $1 > 255 || $3 < 0 || $3 > 255 ||
			    $5 < 0 || $5 > 255 || $7 < 0 || $7 > 255 ||
			    $9 < 0 || $9 > 255 || $11 < 0 || $11 > 255) {
				$$ = 1;
			} else {
				data_dest.su_sin.sin_len = sizeof(struct sockaddr_in);
				data_dest.su_sin.sin_family = AF_INET;
				p = (char *)&data_dest.su_sin.sin_port;
				p[0] = $9; p[1] = $11;
				a = (char *)&data_dest.su_sin.sin_addr;
				a[0] = $1; a[1] = $3; a[2] = $5; a[3] = $7;
				$$ = 0;
			}
		}
	;

host_long_port4
	: NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
		NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
		NUMBER
		{
			char *a, *p;

			/* reject invalid LPRT command */
			if ($1 != 4 || $3 != 4 ||
			    $5 < 0 || $5 > 255 || $7 < 0 || $7 > 255 ||
			    $9 < 0 || $9 > 255 || $11 < 0 || $11 > 255 ||
			    $13 != 2 ||
			    $15 < 0 || $15 > 255 || $17 < 0 || $17 > 255) {
				$$ = 1;
			} else {
				data_dest.su_sin.sin_len =
					sizeof(struct sockaddr_in);
				data_dest.su_family = AF_INET;
				p = (char *)&data_dest.su_port;
				p[0] = $15; p[1] = $17;
				a = (char *)&data_dest.su_sin.sin_addr;
				a[0] = $5; a[1] = $7; a[2] = $9; a[3] = $11;
				$$ = 0;
			}
		}
	;

host_long_port6
	: NUMBER COMMA NUMBER COMMA NUMBER COMMA NUMBER COMMA
		NUMBER COMMA NUMBER COMM